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KMID : 1159320090110020105
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Korean Journal of Vision Science
2009 Volume.11 No. 2 p.105 ~ p.112
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Measurement of the Near Point of Convergence of High School Students
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So Jong-Phil
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Abstract
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Purpose : In spite of the fact that near point of convergence(NPC) is an important factor in diagnosing the convergence insufficiency(CI), NPC is measured by various methods without the standardized method. so we measure the NPC break values and the recovery values of high school students.
Methods : The subjects were 137 high school students who didn’t have any eye diseases, suppression, strabismus, and accommodative disorder. And their distance and near visual acuity with correct or without correct were above 1.0. We measured NPC by three methods, and the distance and near phoria were measured, and then classified them into the normal subjects and convergence insufficiency(CI) subjects - their NPC were above 10 cm and esophoria is greater at distance than at near and analyzed the results.
Results : The NPC break values and the recovery values for the normal subjects were AT 6.06±1.89 cm, PL 5.77±1.93 cm, PLRG 6.68±3.19 cm, total 6.17±2.43 cm and the recovery values were AT 10.40±2.43 cm, PL 10.11±2.55 cm, PLRG 11.37±5.08 cm, total 10.62±3.58 cm respectively, and the NPC break values and the recovery values for the convergence insufficiency(CI) subjects were AT 12.26±4.42 cm, PL 13.83±5.70 cm, PLRG 14.35±5.63 cm, total 13.40±5.19 cm, and the recovery values were AT 16.95±5.00 cm, PL 18.51±6.37 cm, PLRG 20.93±8.66 cm, total 18.65±6.73 cm respectively.
Conclusion : The NPC break and recovery values for the normal subjects were 6.17±2.43 cm, 10.62±3.58 cm, insufficiency(CI) subjects were 13.40±5.19 cm, 18.65±6.73 cm respectively. I suggest a clinical cutoff value of 8 cm for NPC break and 14 cm for the MPC recovery.
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KEYWORD
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AC/A ratio, CI, convergence insufficiency, NPC, near point of convergence
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